Caveat - Tmpfs is "booted" session only - until set as above Shared memory file system is a "virtual" file management concepttmpfs is similar to an initrd content -( temporary) - usage may be as suggested in URL

What is the access Problem - drive not found/mounted, DMA *probe not read, in/out reads fail:

*Hdparm will give drive data -@ present settings

Processor cache would be a hardware BIOS setting, unless cpu Cfg utility has been installed, mis-applied 'Tho' I am unaware of any such capability in either

(Without a level one or two CPU cache, you should experience MANY weird results)

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